—How do you deal with the disagreement between the company　and the customers?—The key________ the problem is to meet the demand____　____by  the customers?

An underwater hotel has opened in Africa，with its rooms＿on the bottom of a three－level floating building．

A group of Chinese guests, who are the first ________ from the new agreement on tourism between China and Switzerland, were given a warm welcome in Geneva(日内瓦) last Saturday.

___ from space, the earth with water ___70％ of its surface looks like a "blue blanket". 

He is so humorous that he had us       all through the meal.